In reply to 2E0HJD:
I personaly have a s9 noise
level at the home qth on the lower bands dropping to about s7 around
20m. and it is getting worse with passing months. i blame it on
pc`s,phone chargers, games consoles,digital tv boxes etc etc it seems
there are no checks on any of he imported junk from Hong Kong into the
uk at all these days.
QRO is the way to go
Ps i can only work what i hear !!
Hi Mick, have you tried identifying the local noise sources ?.
I have succesfully done so at my home QTH, reducing 20m noise from S7 to S0.
I did this by making small magnetic loops out of house wire for each band and tracking down the noise sources. These were then addressed by fitting split ferrite rings (TDK) to power leads and high pass filters to tv aerials etc.
The worst offenders were low voltage lighting in the bathrooms and the tv.
I also fitted ferrite and high pass filters to my neighbours tv after she complained about tvi, which solved her problems and mine.
You can also use antennas with lower local noise pickup. e.g. Magnetic loops and/or shielded loops for the low bands. Half wave loops/square dipoles (cobbweb) have lower noise pickup than straight dipoles. Hex beams / moxon rectangles have lower local noise pickup than straight yagis (in my opinion).
Verticals are awful for noise pickup, but you can often make a dramatic difference by moving them just a few meters further away from a noise source.
As you say if you cant hear them you cant work them !.